Added a vector equality operator.
Added a compile-time integral-based truncating alternative for rotating.

When it comes time to get the actual rotate result, the new function:
do_round checks at compile time whether or not the caller wanted an
integral value or not. If an integral number is requested the floating
point number is rounded, otherwise it's just a pass through that returns
what was given to it.
Removed the semicolons after the two namespaces two end curly braces.

Removed after namespace pong and namespace math in the vector.h file.
Added two pong::math::vector tests.

One for the vector equality operator, one for the rotation operation.